Daisy told Pearl: “I thought you were very sick. There were times when I thought you were so ill that I might lose you.”

Pearl replied: “You know what, Daisy? You very nearly did.”

Yet this was not the first bombshell to rock Daisy’s young life. Three years earlier she had discovered her dad was not actually her ­biological father.

A year before Daisy’s birth in January 1989, Pearl had ended a relationship with New Yorker Bronner Handwerger who she’d met travelling in Israel.

But after discovering she was pregnant the pair reunited, wed in Miami and headed to London to start family life, only to split up in 1990. Soon after the marriage ended, when Daisy was just one, Pearl was brutally raped by a close friend.

The attack was so bad that she had to go to ­hospital for a week.

Despite her parents’ pleas, Pearl was too ­traumatised to go to the police and her attacker was never charged.

With the help of good friend rock musician Gavin Rossdale – who would find fame as the singer and guitarist in Bush – she began song writing. In 1993, Pearl formed and fronted an indie band called Powder.

At 24, Pearl started dating Supergrass ­drummer Danny Goffey, now 42. But their rock lifestyle meant the temptation of drugs was never far away.

Pearl first took heroin in the mid 90s, ­claiming it was offered to her by a musician.

She said: “It was the most incredible thing I had ever taken. My whole body and mind seemed to ascend to heaven.”

Daisy was left stunned after discovering her real father was Gavin Rossdale

Danny and Pearl’s first son Alfie was born at London’s Portland Hospital in 1996 – a year after she had miscarried after taking a cocktail of cannabis, cocaine and ecstasy while ­pregnant. Shortly after the birth she took a line of cocaine on the ward.

Three years later she nearly lost him. She said: “I was high on heroin and my son Alfie took a load of my sleeping pills. I was upstairs getting off my head on smack.

“It was a horrible experience. Luckily, I came downstairs just in time and got them out of his mouth before he ­swallowed them.”

She stayed clean after the scare but relapsed in 2001 after the wife-swapping claims.

She then moved to the countryside to focus on recovery. Meanwhile Pearl’s parents Eddie and Leila Davies stepped in to look after Daisy, then studying for her GCSEs. Daisy said: “My grandparents had always helped look after me, they were always there.”

When Daisy was 15, Pearl insisted Gavin, with whom she’d had a brief fling while dating Bronner, take a DNA test.

Daisy had always assumed Bronner Handwerger was her biological dad

The results showed Gavin, by then married to No Doubt singer Gwen Stefani, was not only Daisy’s godfather but also father.

Gwen was said to be distraught by the news and Gavin and Pearl’s friendship came to an abrupt end.

But Daisy, despite believing Bronner to be her father all those years, stayed strong. She said: “I was so happy the day I found out Gavin was my dad. I’d always looked up to him.

“But it was still a s**tshow trying to get over it. There’s no handbook.”

Despite her difficult start, Daisy is close to mum Pearl (Image: Getty Images)

Such chaos would have shaken some ­teenagers to the core but Daisy concentrated on her burgeoning modelling career.

She has been no stranger to heartbreak since. In April 2014 her friend Peaches Geldof died of a heroin overdose and on day one of Strictly rehearsals she suffered another blow.